zoo-like classes in c++?
No, zoo does not use builtin time and date classes. It does not know anything about Date, chron, POSIXct, etc. Its completely general and only assumes that whatever classes you use are ordered (that's the O in zoo) and have certain methods defined. See ?zoo for more information on the methods assumed. For example, here we are using letters as our time/date class. The time/date class in this example is not even numeric:
library(zoo) z <- zoo(11:15, letters[1:5]) merge(z, lag(z, -1))
z lag(z, -1) a 11 NA b 12 11 c 13 12 d 14 13 e 15 14 (Actually there are a few exceptions to the above for convenience, i.e. "yearqtr" and "yearmon" classes are provided, as.Date.numeric is provided and read.zoo understands Date and POSIXct classes but overall the statement that its perfectly general is correct.)
On 7/31/07, Jordi Molins <jordi.molins.coronado at gmail.com> wrote:
I usually use zoo for my time series in R. However, sometimes my algorithms
are very slow. Maybe my code is inefficient, but I need to add several for
and ifs, which I believe slows down the whole calculation.
I have been thinking that if I could use the C++ STL for intersections (and
other operations), in addition to use the fast for and if in c++, the
calculation could be much faster. My problem is that I do not know any time
and date class in C++ with the same conventions as in zoo and POSIX. I have
been googling, and I have found Boost.Date_Time, which apparently does quite
a lot of what I want.
Is zoo using some time and date class from C++? If yes, which one? if not,
which one could I use?
Thank you.
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